illapsus: (inl-), a, um, Part., from illabor.illapsus: (inl-), ūs, m. illabor,I a falling, gliding, or flowing in: umoris illapsus atque exitus, Col. 2, 2, 11: serpentino illapsu, Ambros. Ep. 6, 42: gregis illapsu fremebundo territus, Sil. 3, 463.